In Mad, Bad, Dangerous to Know Colm Toibin turns his incisive gaze to three of Ireland's greatest writers, Oscar Wilde, W.B. Yeats and James Joyce, and their earliest influences: their fathers. From Wilde's doctor father, a brilliant statistician and amateur archaeologist, who was taken to court by an obsessed lover in a strange premonition of what would happen to his son; to Yeats' father, an impoverished artist and brilliant letter-writer who could never finish apainting; to John Stanislus Joyce, a singer, drinker and story-teller, a man unwilling to provide for his large family, whom his son James memorialised in his work.

Colm Toibin illuminates not only the complex relationships between three of the greatest writers in the English language and their fathers, but also illustrates the surprising ways they surface in their work.